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Metric thread cutting on a Colchester

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Dave Green 425/03/2020 14:49:32
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Hello all. The name is Dave. I've just got myself a Colchester mrk1 lathe (I think) just trying to get to grips the the thread cutting thing. I'm tying to cut metric threads but I think the gears on the back could be the wrong way round. As in number of teeth. Can someone clarify this

At the top is a 42t the big one is 120t. That meshes into a 35t

DC31k25/03/2020 19:20:34
182 forum posts

Colchester is a brand of lathe, just as Ford is a brand of car. Ford made Mark 1 Cortinas, Escorts and Capris.

You need to find out exactly what machine you have and obtain a manual for it. Read that manual very well.

From the tooth numbers of the gears you give, it is possible that you have a Colchester Student. If so, kindly read this thread:

https://www.model-engineer.co.uk/forums/postings.asp?th=150056

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